Carotid Sinus Syndrome in a Patient with Head and Neck Cancer: A Case Report.

Syncope is a common complaint among patients presenting to the emergency department. Its differential diagnosis is broad and its management varies significantly depending on the underlying etiology. This is especially complex in patients with head and neck cancer since it may appear as an initial manifestation of the disease, as a side effect of surgery or radiotherapy, or as an indicator of local recurrence. Carotid sinus syndrome is a rare disease, whose pathophysiology is not yet fully understood. Here, we present the rare case of a 79-year-old male patient with a left cervical lymph node metastasis from an occult primary malignancy, who was admitted due to recurrent syncope. Paroxysms of extreme bradycardia were detected and a definitive dual chamber pacemaker was placed; however, the patient remained symptomatic. Cervical CT-scan revealed incarceration and compression of the left carotid sinus. The patient underwent radiotherapy, with favourable response, and remains asymptomatic to date.